While the Bexar County medical examiner's office has not yet determined exactly what killed Maddoux, the child died from complications of a dental procedure, officials said. The office has ordered a toxicology report to further investigate Maddoux's death.

"The doctor feels bad for the family about the outcome," Anderson said. "Morphine was administered, but it was actually under the minimum dose for his body weight."

Anderson said he wasn't sure exactly how much morphine Maddoux was given, or how much he should have received according to his body weight, but said the dosage given was "well within limits."

He added that it is not unusual for Seastrunk, a 1993 graduate of the University of Texas Health Science Center medical school, to use morphine on toddlers. When asked if it was alarming that morphine was given to a child as young as Maddoux, Anderson replied, "Absolutely not. It's not abnormal."

Maddoux's mother, Monica Meza, said the toddler went home with his grandmother after the procedure and stopped breathing several hours later. He was hospitalized but never regained consciousness, Meza said, and eventually his heart stopped, his lungs collapsed and he became brain-dead.

Tuesday afternoon, the surgical center where Maddoux's procedure was done released a statement.

"Everyone associated with our surgery center is deeply saddened by the death of this child," it said. "Our hearts and prayers go out to the family during their time of grief."

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As authorities try to determine exactly what killed Maddoux, his parents have begun planning his funeral.

Visitation is scheduled for 8 a.m. to 5 p.m. Friday at Mission Park Funeral Chapel South at 1700 S.E. Military Drive. There will be a Mass at 10 a.m. Saturday at Resurrection of the Lord Catholic Church at 7990 W. Military Drive, and interment will be at Mission Park Funeral Chapel South.